Поставьте предложение а) в вопросительную б) в отрицательную форму 1.I am at work.2.Mike is a doctor.3.They are glad.4.My mother is in the garden.5.My friends are happy.6.Susan is in that room.7.Olga is my friend.8.Marry and Alex are at home.9.I am sure of it.10.This book is interesting.

1) I am not at work. Am I at work?

2) Mike isn't a doctor. Is Mike a doctor?

3) They aren't glad. Are they glad?

4) My mother isn't in the garden. Is my mother in the garden?

5) My friends aren't happy. Arr my friends happy?

6) Susan isn't in that room. Is Susan in that room?

7) Olga isn't my friend. Is Olga my friend?

8) Marry and Alex aren't at home. Are Marry and Alex at home?

9) I am not sure of it. Am I sure of it?

10) This book isn't interesting. Is this book interesting?

Объяснение:

Так это глагол to be. Вот так образуются отрицательная и вопросительная форма глагола to be. Когда мы хотим сделать отрицательное предложение так мы добавляем not к глаголу to be. А когда вопросительную ставим глагол to be в начало предложение. Думаю объяснила.Удачи!